Every question from past board papers on Purification and Characterisation of Organic Compounds, newest paper first. Open any question for its full worked answer.
Match List I with List II
List I (Mixture): A. \(\mathrm{CHCl_3}\) + \(\mathrm{C_6H_5NH_2}\) B. Crude oil in petroleum industry C. Glycerol from spent-lye D. Aniline - water
List II (Method of Separation): I. Distillation under reduced pressure II. Steam distillation III. Fractional distillation IV. Simple distillation
Choose the correct answer from the options given below :
Which one of the following reactions does NOT belong to "Lassaigne's test"?
On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as
In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe\(^{3+}\) due to the formation of -
The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds ?
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]
Paper chromatography is an example of :
The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is :
